EXCLUSIVE: 'Grey's Anatomy' to Introduce DeLuca's Sister in Season 14 — and She's 'Stirring Things Up'!

Grey’s Anatomy is digging into Dr. Andrew DeLuca’s backstory — and that means meeting one of his immediate family members.

Giacomo Gianniotti revealed that in the 14th season of ABC’s hit medical drama, viewers will be introduced to DeLuca’s sister, who will be walking the halls of Grey Sloan Memorial Hospital.

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“We are bringing my sister [in] as a new character. She is going to be a new presence at the hospital. She comes from Italy, as my character is Italian, and you get to see us exchanging some blows in Italian, which will be very interesting,”Gianniotti told ET, who has played DeLuca since season 11, at the Disney/ABC cocktail party at the Beverly Hilton Hotel on Sunday.

Gianniotti wouldn’t divulge DeLuca’s sister’s medical expertise or the reason driving her to settle in Seattle, Washington, but offered this telling nugget.

“Her profession, although we can’t disclose it, is a very interesting one,” he hinted. “It’s going to keep a lot of the doctors on their toes, make some doctors uncomfortable [and] some people will be glad about [her coming on]. She’ll stir things up with a European background and take on medicine.”

The 28-year-old actor, who was born in Rome, expressed excitement over the opportunity to dust off his Italian for the small screen: “It’s great!”

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Gianniotti revealed that the part is already cast and played coy about the actress who plays her. “I can’t wait for you guys to meet her. She’s lovely. She’s going to be a great new addition to the show,” he said, staying mum on when viewers will first meet her, though it’s expected to be a multi-episode arc.

But despite the secrecy, Gianniotti promised that the new season will see more of DeLuca’s layers being peeled back.

“This season, we’re definitely going to get to know DeLuca a lot better. The writers have told me that they’re fleshing him out a lot,” he assured.

Grey’s Anatomy kicks off season 14 with a two-hour premiere Thursday, Sept. 28 at 8 p.m. ET/PT on ABC.

For more, watch the video below.

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